Form with nested resource: can't keep the association - ruby-on-rails

Question

I have a problem with a form with nested resource. The data model is easy:
class Event < ActiveRecord::Base
extend FriendlyId
friendly_id :name, use: [:slugged, :finders]
has_many :event_contents
end
class EventContent < ActiveRecord::Base
belongs_to :event
end
My form:
= simple_form_for([:admin, #event, #event.event_contents.new], remote: true) do |f|
.chat-form
.input-cont
= f.input :content, label: false, input_html: { class: 'form-control' }
.btn-cont
%span.arrow
= f.submit 'invia', class: 'btn blue icn-only'
The controller:
class Admin::EventContentsController < AdminController
def create
#event_content = EventContent.new event_content_params
#event_content.user_id = current_user.id if current_user
if #event_content.save
respond_to do |format|
format.js { render :nothing => true }
end
else
end
end
private
def event_content_params
params.require(:event_content).permit(
:content,
:event_id,
:user_id
)
end
end
When i submit the post in the params instead of event_id I have the event "slug"
pry(#<Admin::EventContentsController>)> params
=> {"utf8"=>"✓", "event_content"=>{"content"=>"uhm"}, "commit"=>"invia", "action"=>"create", "controller"=>"admin/event_contents", "event_id"=>"test-test-test"}
The record is created in the db, but event_id is nil so the association is broken.
Why instead of the event_id I have the event slug???
Update
The issue was the controller:
def create
#event = Event.find params[:event_id]
#event_content = #event.event_contents.build event_content_params
#event_content.user_id = current_user.id if current_user
if #event_content.save
respond_to do |format|
format.js
end
else
end
end

Answer 1

Maybe try doing the following:
in your Event model add accepts_nested_attributes_for :event_contents
in your form, when you are collecting the :event_contents replace
f.input :content, label: false, input_html: { class: 'form-control' }
with the following:
f.fields_for :event_contents do |content|
content.input :content
end
update your strong params in your Events controller to include {:event_contents_attributes} which might look something like below depending on the other params you need to pass through:
params.require(:event).permit(:name, {:event_contents_attributes => [:content]})
In your Events controller, update def new to include this line item event_content = #event.event_contents.build
All that to say, I believe you would want this to be routed to your Events controller and not your EventContents controller because the :event_contents are nested in the :event. It looks like your form is submitting to the EventContents controller currently. Also, I don't believe this argument in your simple_form_for #event.event_contents.new is necessary.
Here's what I built off of your question. It's not admin namespaced but might be helpful.
class EventsController < ApplicationController
def new
#event = Event.new
event_content = #event.event_contents.build
end
def create
#event = Event.new(event_params)
respond_to do |format|
if #event.save
format.html { redirect_to #event, notice: 'Event was successfully created.' }
format.json { render :show, status: :created, location: #event }
format.js
else
format.html { render :new }
format.json { render json: #event.errors, status: :unprocessable_entity }
end
end
private
def event_params
params.require(:event).permit(:name, {:event_contents_attributes => [:content]})
end
end
Event model:
class Event < ActiveRecord::Base
has_many :event_contents
accepts_nested_attributes_for :event_contents
end
And finally the form:
<%= form_for(#event) do |event| %>
<div class="field">
<%= event.label :name %><br>
<%= event.text_field :name %>
</div>
<%= event.fields_for :event_contents do |content| %>
<div class="field">
<%= content.label :content %>
<%= content.text_field :content %>
</div>
<% end %>
<div class="actions">
<%= event.submit %>
</div>
<% end %>